Probrico Ball Privacy Door Knob,Bed/Bath Knob, Brushend Satin Nickel Nickel (5Pack) The latch bolt can be locked by thumb turnbutton on the inside knob. An emergency release tool can unlock the door from the outside. This function is ideal for bathroom or bedroom doors where privacy is desired but a keyed cylinder isn&#039;t necessary. Type: Privacy door knob Backset: Adjustable to 2-3/8&#034; or 2-3/4&#034; Door Thickness: 1-3/8&#034; or 1-3/4&#034; Knob Diameter: 2.09&#034;(53mm) Rosette Diameter: 2.56&#034;(65mm) Handing: Left, Right, Reversible Knobs for both sides of the door Latch mechanism Strike plates Mounting screws